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Electrical System
4.2-8 No Platform Level
No Platform Level Up from Base Console:
1. Loose or broken wire #10C from resistor R1 to
platform level switch S15.
2. Defective platform level switch S15.
3. Loose or broken wire #41 from platform level
switch S15 to base terminal block.
4. Loose or broken wire #41 from base terminal
block to turret harness plug pin #16.
5. Loose or broken wire #38 from turret harness
plug pin #16 to platform up valve 4H-41.
6. Loose or broken wire #02 from turret harness
plug to platform up valve 4H-41.
7. Defective platform up coil 4H-41.
No Platform Level Up from Platform Console:
1. Loose or broken wire #04 from platform terminal
block to platform level switch S19.
2. Defective platform level switch S19.
3. Loose or broken wire 41A from S19 to J2 pin #22
of valve driver.
4. No output on J2 pin #24 of the valve driver to
wire #20B.
5. No output on J3 pin #23 of the valve driver to
wire #41.
6. Loose or broken wire #41 from valve driver J3
pin #23 to plug B pin #11 in platform control
console.
7. Loose or broken wire #41 in boom cable B or its
connectors.
8. Loose or broken wire #41 from base connector
plug B pin #11 to base terminal block.
SJ85 AJ
Section 4 – Troubleshooting Information
Check continuity. Replace if defective.
Check continuity through switch while activating
up function between wires #10C and #41. Replace
switch if no continuity.
Check continuity. Replace if defective.
Check continuity. Replace if defective.
Check continuity. Replace if defective.
Check continuity. Replace if defective.
Check continuity and resistance through coil.
Replace if defective.
Check continuity. Replace if defective.
Check continuity through switch while activating
function between wires #4 and #41A. Replace
switch if no continuity.
Check continuity. Replace if defective.
Check for 12 volts. If no voltage present with foot
on footswitch check section 5 for OCM pin voltage
reference.
Check for a minimum 3.5 volts. If no voltage
present with foot on footswitch check section 5 for
OCM pin voltage reference.
Check continuity. Replace if defective.
Check for continuity between pins #11 on cable B.
Check for loose or corroded connections on cable
connectors. Replace if wire is defective.
Check continuity. Replace if defective.
229044ADA
115
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